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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                declare(strict_types=1);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Doctrine\Migrations;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use function substr;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @internal  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                final class VersionAliasResolver  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private const ALIAS_FIRST   = 'first';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private const ALIAS_CURRENT = 'current';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private const ALIAS_PREV    = 'prev';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private const ALIAS_NEXT    = 'next';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private const ALIAS_LATEST  = 'latest';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /** @var MigrationRepository */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $migrationRepository;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __construct(MigrationRepository $migrationRepository)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->migrationRepository = $migrationRepository;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Returns the version number from an alias.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Supported aliases are:  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * - first: The very first version before any migrations have been run.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * - current: The current version.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * - prev: The version prior to the current version.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * - next: The version following the current version.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * - latest: The latest available version.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * If an existing version number is specified, it is returned verbatimly.  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function resolveVersionAlias(string $alias) : ?string  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if ($this->migrationRepository->hasVersion($alias)) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            return $alias;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        switch ($alias) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            case self::ALIAS_FIRST:  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                return '0';  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            case self::ALIAS_CURRENT:  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                return $this->migrationRepository->getCurrentVersion();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            case self::ALIAS_PREV:  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                return $this->migrationRepository->getPrevVersion();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            case self::ALIAS_NEXT:  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                return $this->migrationRepository->getNextVersion();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            case self::ALIAS_LATEST:  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                return $this->migrationRepository->getLatestVersion();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            default:  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                if (substr($alias, 0, 7) === self::ALIAS_CURRENT) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                                    return $this->migrationRepository->getDeltaVersion(substr($alias, 7));  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                return null;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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